These special blocks provide a lap joint arrangement for outside corners for the Pisa Light® wall systems.
https://brownsconcrete.com/products/garden-retaining-walls/17-hardscape-products/garden-retaining-walls/pisa-light/36-pisa-light-corner#sigProId444cbbef5b
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Unit Dimensions: 11.4" x 7.9" x 5.9" (290mm x 200mm x 150mm)
Unit Weight: 48 lbs (21.8 kg) each